Radeon HD Series 5770 6770 Specs

The "new" Radeon HD 6700 series GPUs have 1040 million transistors. Correct, that is 1+ billion transistors tucked away in a small chip. The fabrication node, just like the 5800 series, is 40nm for this product.

The reference Radeon HD 5770 / 6770 will be clocked at 850 MHz. Its memory is clocked at 1200 MHz (4800 MHz effective).

The ASUS 6770 DirectCU Silent is clocked at 850 MHz and the memory is clocked at 1000 MHz (4000 MHz effective).

Shader processors then; similar to the Radeon HD 4850/4870/4890/5770 and now 6770, will have 800 Shader processors again... same 40nm chip.

The number of ROP units are rocking steady at 16 and sure -- texture units remain at 40 for the 6770.

These numbers are reasonably good, for the money this is a nice entry level product series. Much of the magic is thanks to the fact that ATI sticks to DDR5 for their mid-range and high-end products. On the 6770 they'll crank it down a notch as we get 128-bit memory, cutting the bandwidth in half from 256-bit. However, since it's GDDR5 memory (quad data rate) it will still offer sufficient bandwidth, 80GB/sec of it actually.

But sure the culprit of the 5700/6700 series will be that cut off memory bandwidth, and this is the reason why its performance actually will be slightly lower (on average) than say a Radeon HD 4870.

So the card while cooled passively, is clocked at 850 MHz and the 1GB 128-bit GDDR5 memory clocks in at an effective data-rate of 4000 MHz, slightly slower than reference actually. As said before, this product has 800 shader processors.

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